/* ========================================
   LINE OA Manager - 樣式表
   ======================================== */

:root {
    /* LINE 品牌色彩 */
    --line-green: #06C755;
    --line-green-dark: #05a348;
    --line-green-light: #e8f8ef;
    
    /* 主題色彩 */
    --primary: var(--line-green);
    --primary-dark: var(--line-green-dark);
    --primary-light: var(--line-green-light);
    
    /* 中性色 */
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #e9ecef;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --border-color: #dee2e6;
    
    /* 訊息氣泡 */
    --bubble-user: #e9ecef;
    --bubble-admin: var(--line-green);
    --bubble-admin-text: #ffffff;
    
    /* 陰影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    
    /* 間距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    /* 圓角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    /* 動畫 */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    
    /* 尺寸 */
    --sidebar-width: 320px;
    --header-height: 64px;
    --input-height: 60px;
}

/* ========================================
   Reset & Base
   ======================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ========================================
   Layout
   ======================================== */

.app-container {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ========================================
   Sidebar
   ======================================== */

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    height: var(--header-height);
    padding: 0 var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-add {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--primary);
    transition: background var(--transition-fast);
}

.btn-add:hover {
    background: var(--primary-light);
}

.user-list {
    flex: 1;
    overflow-y: auto;
}

.empty-state {
    padding: var(--spacing-xl);
    text-align: center;
    color: var(--text-muted);
}

.empty-state .hint {
    font-size: 12px;
    margin-top: var(--spacing-xs);
}

.user-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    cursor: pointer;
    transition: background var(--transition-fast);
    border-bottom: 1px solid var(--border-color);
}

.user-item:hover {
    background: var(--bg-tertiary);
}

.user-item.active {
    background: var(--primary-light);
}

.user-item .avatar {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
    flex-shrink: 0;
    overflow: hidden;
}

.user-item .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-item .user-info {
    flex: 1;
    min-width: 0;
}

.user-item .user-name {
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-item .last-message {
    font-size: 13px;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-top: 2px;
}

.user-item .meta {
    text-align: right;
    flex-shrink: 0;
}

.user-item .time {
    font-size: 12px;
    color: var(--text-muted);
}

/* ========================================
   Chat Container
   ======================================== */

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    min-width: 0;
}

.no-chat-selected {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder {
    text-align: center;
    color: var(--text-muted);
}

.placeholder svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.placeholder p {
    font-size: 16px;
}

.chat-room {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.chat-room.hidden {
    display: none;
}

/* ========================================
   Chat Header
   ======================================== */

.chat-header {
    height: var(--header-height);
    padding: 0 var(--spacing-lg);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chat-header .avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
    overflow: hidden;
}

.chat-header .avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.user-details h2 {
    font-size: 16px;
    font-weight: 600;
}

.user-details .user-id {
    font-size: 12px;
    color: var(--text-muted);
    font-family: monospace;
}

.chat-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon.btn-danger:hover {
    background: #fee2e2;
    color: #dc2626;
}

/* ========================================
   Message Area
   ======================================== */

.message-area {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 70%;
}

.message.user {
    align-self: flex-start;
}

.message.admin {
    align-self: flex-end;
}

.message .bubble {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-lg);
    word-wrap: break-word;
    white-space: pre-wrap;
}

.message.user .bubble {
    background: var(--bubble-user);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message.admin .bubble {
    background: var(--bubble-admin);
    color: var(--bubble-admin-text);
    border-bottom-right-radius: var(--radius-sm);
}

.message .timestamp {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.message.user .timestamp {
    text-align: left;
}

.message.admin .timestamp {
    text-align: right;
}

.message.sending .bubble {
    opacity: 0.7;
}

.message.error .bubble {
    background: #fee2e2;
    color: #dc2626;
}

/* Date Separator */
.date-separator {
    text-align: center;
    margin: var(--spacing-md) 0;
}

.date-separator span {
    background: var(--bg-secondary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: 12px;
    color: var(--text-muted);
}

/* ========================================
   Input Area
   ======================================== */

.input-area {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-end;
}

.input-area textarea {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    resize: none;
    min-height: 40px;
    max-height: 120px;
    outline: none;
    transition: border-color var(--transition-fast);
}

.input-area textarea:focus {
    border-color: var(--primary);
}

.btn-send {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.btn-send:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.btn-send:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
}

/* ========================================
   Modal
   ======================================== */

.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    margin: var(--spacing-md);
    animation: modalIn 0.2s ease;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-header {
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 18px;
    font-weight: 600;
}

.btn-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.btn-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-body {
    padding: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.form-group input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-group input:focus {
    border-color: var(--primary);
}

.form-group small {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 12px;
    color: var(--text-muted);
}

.modal-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-sm);
}

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
}

.btn-primary {
    background: var(--primary);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

/* ========================================
   Toast Notifications
   ======================================== */

.toast-container {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: toastIn 0.3s ease;
    max-width: 350px;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.toast.success {
    border-left: 4px solid var(--primary);
}

.toast.error {
    border-left: 4px solid #dc2626;
}

.toast.info {
    border-left: 4px solid #3b82f6;
}

.toast-message {
    flex: 1;
}

/* ========================================
   Utility Classes
   ======================================== */

.hidden {
    display: none !important;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .chat-container {
        width: 100%;
    }
    
    .message {
        max-width: 85%;
    }
}

/* ========================================
   Scrollbar Styling
   ======================================== */

::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   Loading Spinner
   ======================================== */

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}